silicone mold and vacuum injection molding

silicone mold and vacuum injection molding

vaccum casting, also known as vacuum casting. under vacuum conditions in both the castable for deaeration, stirring, preheating, note type, and at 60 ℃, 80 ℃ in the constant temperature box of 2 to 3 hours of secondary curing process. it is suitable for the trial production of small batch in the process of product development.

technical parameters:

applicable mold: silicone mold (life 10-20 pieces).

pouring material: two-component polyurethane pu. materials used: axson polyurethane resin, hei-cast polyurethane resin.

properties: like abs, pp, nylon, pmma/pc transparent, soft rubber parts shord (40-90 d), high temperature (150 ℃), fire prevention materials and so on.

general working time: 1-4 hours per unit.

standard reproduction accuracy: 0.20mm/100mm.

thickness of pouring sample: minimum 0.5mm, best 1.5mm-5mm.

maximum pouring workpiece: 2000mmx1200mmx1000mm.


(1) silicon mold preheating. heat the silicon mold in advance to 60-70 ℃, die temperature too low, will cause the curing incomplete, cause poor physical properties. the die temperature is directly related to the dimensional accuracy of the specimen.

(2) pre-defoaming of pouring material. vacuum defoaming of liquid a and liquid b in a real empty box for more than 30 minutes was carried out.

(3) pouring. place the containers containing liquid a and liquid b in the operating room respectively. after vacuuming in the operating room, periodically stir liquid b to debubble for 5-10 minutes, pour liquid a into liquid b and stir for 30-40 minutes, and then quickly pour into the silicone rubber mold. the operation of atmospheric pressure recovery shall be carried out within 1 minute to 1 minute and 30 seconds from the beginning of mixing.

(4) curing. in the 60-70 ℃ constant temperature box for 30 to 60 minutes after curing, demoulding. when necessary, in 70-80 ℃ thermostat secondary curing for 2-3 hours.